Linux Shell Scripting Cookbook - Third Edition

How to do it...

The following script uses find to locate PNG and JPEG files, then uses the ## operator and mv to rename them as image-1.EXT, image-2.EXT, and so on. This changes the file's name, but not its extension:

#!/bin/bash 
#Filename: rename.sh 
#Desc: Rename jpg and png files 

count=1; 
for img in `find . -iname '*.png' -o -iname '*.jpg' -type f -maxdepth 1` 
do 
  new=image-$count.${img##*.} 

  echo "Renaming $img to $new" 
  mv "$img" "$new" 
  let count++ 

done  

The output is as follows:

$ ./rename.sh
Renaming hack.jpg to image-1.jpg
Renaming new.jpg to image-2.jpg
Renaming next.png to image-3.png

The preceding script renames all the .jpg and .png files in the current directory to new filenames in the format image-1.jpg, image-2.jpg, image-3.png ...